Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a50a793a7ff5731…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 06:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 397ad0c4113ee295559c27a226b73c23 SHA-1: ab39afc2fe7bd592b69724f1cae013b336570406 SHA-256: 7a50a793a7ff5731d3c28bdd2272d91c79439ee2d67b92229b4b96db558fb29a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. Embedded JavaScript streams are present, suggesting the potential for further malicious actions like exploiting vulnerabilities or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://karcannakliyat.com/userfiles/file/latedomigagadolelopefej.pdf In PDF document text
    • http://duonglaohanoi.com/userfiles/file/puwubedejipabidipurew.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc788c3fe---zugodorimunapizi.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/93775655444.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/80454434234.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/39905311191.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/54586673424.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/56416144958.pdfIn PDF document text
    • https://kapefashion.com/files/files/bazavedezujugumomudono.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/28848194552.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/gumafojukopila.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210913145136.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1e56d903---sowixewasatufa.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/70206602123.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba17cf66d---95264128752.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/30027670064.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/65498382058.pdfIn PDF document text
    • https://tessuno.com/upload/files/613f97ec7635d.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb6a01d028---kilobumujutebagakekekokep.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/77630025856.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/norexokowewoguwu.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/levefuvimoladitel.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/veloneteni.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/wutupomekemitaribir.pdfIn PDF document text
    • https://asken.as/bilder/file/bupinaxum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=learn+deutsch+a1+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 18496 bytes
SHA-256: ecece225ceb2b19c1856be7f20571e54a067c573260ac19ed4f474629663ea5a
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 10568 bytes
SHA-256: 4c7046b7792593fa0d3d3c8503e8b5f76354c407d21efd7b050ba1d8e8595f28

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